test/jdk/java/util/Locale/Bug8004240.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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/*
 * @test
 * @bug 8004240
 * @summary Verify that getAdapterPreference returns an unmodifiable list.
 * @modules java.base/sun.util.locale.provider
 * @compile -XDignore.symbol.file Bug8004240.java
 * @run main Bug8004240
 */

import java.util.List;
import sun.util.locale.provider.LocaleProviderAdapter;

public class Bug8004240 {

    public static void main(String[] args) {
        List<LocaleProviderAdapter.Type> types = LocaleProviderAdapter.getAdapterPreference();

        try {
            types.set(0, null);
        } catch (UnsupportedOperationException e) {
            // success
            return;
        }

        throw new RuntimeException("LocaleProviderAdapter.getAdapterPrefence() returned a modifiable list.");
    }
}